The Defense Argues:The Plaintiff was able to say
“Yes, I’m fine. I’m okay. I was wearing my seat belt,” to various questions.
When he exchanged information:
“Look in my briefcase. There’s my business card.”
He knew where it was.

Source: Graham, Gennarelli, Greenfield’s Neuropathology, ©1996 Oxford University Press, page 197.
The concussions that disable, are almost always more symptomatic at 24 hours, than at the 2-4 hour time frame when injured persons are evaluated in the emergency room. Brain injury symptoms escalate over the first 24 hours, because brain injury involves a cascade of events. It is critical that if you are still symptomatic the day after your injury, go back to the same Emergency Room, don’t wait for a doctors appointment. It is critical that the Emergency Room personnel see that the symptoms still persist or have gotten worse.